CN114032083A - Crosslinking agent for reconstructing wellbore fracture and preparation method and application thereof - Google Patents
Crosslinking agent for reconstructing wellbore fracture and preparation method and application thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims description 9
- 239000012530 fluid Substances 0.000 claims abstract description 42
- 239000013110 organic ligand Substances 0.000 claims abstract description 18
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 15
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 12
- 150000001639 boron compounds Chemical class 0.000 claims abstract description 10
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910021538 borax Inorganic materials 0.000 claims abstract description 7
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004327 boric acid Substances 0.000 claims abstract description 7
- 239000000176 sodium gluconate Substances 0.000 claims abstract description 7
- 235000012207 sodium gluconate Nutrition 0.000 claims abstract description 7
- 229940005574 sodium gluconate Drugs 0.000 claims abstract description 7
- 239000004328 sodium tetraborate Substances 0.000 claims abstract description 7
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 7
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims abstract description 6
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 claims abstract description 6
- 150000005846 sugar alcohols Polymers 0.000 claims abstract description 6
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims abstract description 5
- 229930195725 Mannitol Natural products 0.000 claims abstract description 5
- 239000004310 lactic acid Substances 0.000 claims abstract description 5
- 235000014655 lactic acid Nutrition 0.000 claims abstract description 5
- 239000000594 mannitol Substances 0.000 claims abstract description 5
- 235000010355 mannitol Nutrition 0.000 claims abstract description 5
- 235000015165 citric acid Nutrition 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 7
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 6
- 229920013818 hydroxypropyl guar gum Polymers 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229920005862 polyol Polymers 0.000 claims description 6
- 150000003077 polyols Chemical class 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 6
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 5
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 230000000844 anti-bacterial effect Effects 0.000 claims description 4
- 239000003899 bactericide agent Substances 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000003381 stabilizer Substances 0.000 claims description 4
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000004132 cross linking Methods 0.000 abstract description 20
- 229920002907 Guar gum Polymers 0.000 abstract description 10
- 239000000665 guar gum Substances 0.000 abstract description 10
- 229960002154 guar gum Drugs 0.000 abstract description 10
- 235000010417 guar gum Nutrition 0.000 abstract description 10
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 abstract description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 8
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 abstract description 5
- 230000003111 delayed effect Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
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- 239000003209 petroleum derivative Substances 0.000 abstract description 2
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- -1 hydroxypropyl Chemical group 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 239000002585 base Substances 0.000 description 10
- 238000010008 shearing Methods 0.000 description 8
- 244000007835 Cyamopsis tetragonoloba Species 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 150000004676 glycans Chemical class 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229920001282 polysaccharide Polymers 0.000 description 3
- 239000005017 polysaccharide Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000002579 anti-swelling effect Effects 0.000 description 2
- 239000002775 capsule Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 235000015110 jellies Nutrition 0.000 description 2
- 239000008274 jelly Substances 0.000 description 2
- 238000000518 rheometry Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention aims to provide a cross-linking agent for reconstructing shaft fracturing, which belongs to the technical field of petroleum and natural gas yield increase and is prepared by the mutual reaction of a boron compound, polyhydric alcohol and an organic ligand. The boron compound is one or two of borax and boric acid, and the polyalcohol is one or more of ethylene glycol, glycerol, n-butanol and pentanol. The organic ligand is one or more of mannitol, sodium gluconate, lactic acid, citric acid and triethanolamine. The invention also discloses a guar gum fracturing fluid, the cross-linking agent for reconstructing shaft fracturing can realize delayed cross-linking, and the cross-linking time is adjustable; the guar gum consumption is reduced, the temperature and shear resistance of the guar gum fracturing fluid is improved, the residue content is reduced, and the damage to a reservoir stratum is reduced.
Description
Technical Field
The invention belongs to the technical field of petroleum and natural gas yield increase, and particularly relates to a cross-linking agent for reconstructing shaft fracture as well as a preparation method and application thereof.
Background
In recent years, the energy consumption structure of China is continuously optimized, and natural gas as clean energy becomes a main growth point for adjusting the energy structure of China and a main force for low-carbon transformation. The unconventional natural gas reserves such as shale gas, coal bed gas and the like are abundant, and the development prospect is wide.
The Fuling shale gas field enters a commercial development stage in 2013, a second-generation fracturing technology is mainly adopted in the early stage, and the development mode is a fracturing technology of multi-section few-cluster perforation and slug type sand adding. The significant effect of the osculating fracturing process is to the artisan that the old well of the coke dam block has the ability to perform a second transformation to increase production. At present, the Fuling construction area adopts a new construction mode of reconstructing a casing with the diameter of 88.9mm in a casing with the diameter of 139.7, and carries out reconstruction shaft fracturing construction of 'sleeve-in-sleeve-fixing'.
In reconstruction shaft fracturing construction, near-well multiple cracks and large leakage amount are generated, sand adding is difficult, high-viscosity hydraulic control cracks need to be used, however, the inner diameter of a sleeve is small, the penetrating aperture of a double-layer sleeve is small, friction resistance during fracturing is high, if fracturing fluid is crosslinked on the ground or in a pumping process, the friction resistance is too large, pumping is difficult, and even equipment is damaged, so that the fracturing fluid needs to have the performance of delaying crosslinking.
Meanwhile, the residue content in the guar fracturing fluid is high, the high-concentration guar is easy to cause reservoir damage to matrix permeability and cracks, the transformation effect is influenced, in order to reduce the residue content, one method is to improve hydroxypropyl guar and improve the purity of guar, but the cost of the improved guar is high; another method is to reduce the concentration of guar gum and reduce the residue content by using a high-efficiency crosslinking agent.
In order to meet the requirement of reconstruction of shaft fracturing modification, the modification volume of a reservoir is increased, and the single well yield is improved; the usage amount of the guar gum is reduced, and the residue content is reduced. The invention provides a cross-linking agent capable of realizing delayed cross-linking, which has adjustable cross-linking time, can be adjusted in real time according to different vertical depths, meets the requirement of reservoir transformation, increases the transformation volume and improves the control of geological reserves; reduce the damage of the reservoir and achieve the aims of reducing cost and improving efficiency.
Disclosure of Invention
The invention aims to provide a crosslinking agent for reconstruction of shaft fracturing, which can realize delayed crosslinking and adjustable crosslinking time by introducing sodium gluconate/mannitol/lactic acid/triethanolamine as a ligand, meet the reconstruction of shaft reservoirs and improve the reconstruction efficiency. In addition, the invention also provides a preparation method of the cross-linking agent.
The invention adopts the following technical scheme:
the crosslinking agent for reconstructing the wellbore fracture comprises the following components in parts by weight:
boron compound: 15-25 parts of liquid polyol: 10-20 parts of an alkali solution with the mass concentration of 10-20%: 15-20 parts of organic ligand: 20-25 parts of water: 1000 parts.
Further, the boron compound comprises one or two of borax and boric acid.
Further, the liquid polyol includes one or more of glycerol, n-butanol and pentanol.
Further, the organic ligand comprises one or more of mannitol, sodium gluconate, lactic acid and citric acid.
Further, the alkali solution comprises one or more of sodium hydroxide, sodium carbonate or sodium bicarbonate.
A preparation method of a cross-linking agent for reconstructing wellbore fracturing comprises the following steps:
step 1: preparing water and polyalcohol into a solution, adding the solution into a three-neck flask provided with a stirrer, a reflux condenser and a funnel, heating, stirring and refluxing, and heating to a first temperature to obtain a first mixture.
Step 2: the polyol solution is mixed with the boron compound and an alkali solution is added with stirring to obtain a second mixture.
And step 3: and mixing the organic ligand with the second mixture, stirring at a second temperature, and cooling to obtain the cross-linking agent.
Further, in the step 1, the temperature of the first mixture is raised to a first temperature in a water bath, wherein the first temperature is 40-60 ℃.
Further, in the step 2, the stirring speed of the stirrer is 50-200 r/min, and the stirring is carried out for 2-4 h at the first temperature.
Further, in the step 3, after the organic ligand is added, the temperature is raised to a second temperature in the water bath, the mixture is stirred for 3-5 hours at the second temperature, the stirring speed is 200-300 r/min, and the second temperature is 70-90 ℃.
The cross-linking agent for reconstructing the shaft fracture, which is applied to the guanidine gum fracturing fluid, comprises the following components in parts by weight: 0.002-0.004 parts of hydroxypropyl guar gum; 0.002-0.004 parts of the crosslinking agent; 0.003 to 0.005 part of pH regulator; 0.001-0.003 parts of a bactericide; 0.001 to 0.005 part of a clay stabilizer; 0.001-0.005 part of cleanup additive and the balance of water.
According to the crosslinking agent for reconstructing wellbore fracturing, borax is hydrolyzed and then undergoes a complex reaction with an organic ligand, the organic ligand is one or more of mannitol, sodium gluconate, lactic acid, citric acid and triethanolamine, and the reaction is carried out at the temperature of 60-90 ℃ to generate the crosslinking agent, wherein the specific conditions are as follows:
the first step is as follows: and (3) hydrolyzing borax to generate boric acid and sodium hydroxide:
Na2B7O4+2H2O→4H3BO3+2NaOH；
the second step is that: dissociation of boric acid into borate ions:
the third step: the borate ions and the organic ligand are subjected to a complex reaction
The action mechanism of the crosslinking agent for reconstructing the shaft fracture prepared by the invention is as follows:
the organic complex is subjected to multi-stage ionization to slowly generate borate ions, and then the borate ions react with cis-ortho hydroxyl on polysaccharide molecular chains in base fluid of the fracturing fluid to generate a three-dimensional network structure. In the crosslinking agent for reconstructing shaft fracture, which is prepared by the invention, excessive organic ligand is wrapped around borate ions to influence the release of the borate ions, so that the crosslinking of the borate ions and polysaccharide molecular chains is delayed, and the aim of delaying crosslinking is fulfilled.
The crosslinking time adjustable principle of the crosslinking agent for reconstructing the shaft fracture prepared by the invention is as follows:
the cis-ortho hydroxyl on a polysaccharide molecular chain in the fracturing fluid and an organic ligand compete for borate ions, the combination of the organic ligand and the borate ions depends on the pH value of the solution, and the crosslinking time can be adjusted according to different vertical depths of a horizontal well. The solvent for adjusting pH value is one or more of sodium hydroxide, sodium carbonate and sodium bicarbonate.
The invention has the following beneficial effects:
1. by applying the technical scheme of the invention, delayed crosslinking can be realized, and the friction resistance along the way in the pumping process is reduced;
2. the cross-linking time can be adjusted, and the cross-linking time is controlled by changing the addition of the composition during configuration according to different vertical depths of the horizontal well, so that the method has universality;
3. effectively reduce the guar gum use concentration, under the normal condition of guaranteeing fracturing fluid performance, reduce the guar gum use concentration, reduce fracturing fluid residue content, reduce the reservoir damage, simultaneously, reduce the guar gum use amount, help reaching the purpose of cost reduction increase.
Drawings
FIG. 1 shows that the cross-linking agent and hydroxypropyl guar gum in the invention are at 85 ℃ and 170s-1Under the condition ofA cross-linked rheology curve;
FIG. 2 shows that the cross-linking agent and hydroxypropyl guar gum in the invention are mixed at 120 ℃ for 170s-1Crosslinking rheology curve under the conditions.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
A cross-linking agent for reconstructing shaft fracturing and a preparation method of guanidine gum fracturing fluid comprise the following steps:
example 1
1. Compounding of crosslinking agent
(1) 100ml of water and 15ml of ethylene glycol were put into a three-necked flask equipped with a stirrer, a reflux condenser and a constant pressure dropping funnel, and stirred uniformly to obtain a first mixture.
(2) Heating the first mixture in a water bath to 40 ℃, adjusting the rotating speed to 100r/min, adding 15g of boric acid and 20ml of sodium carbonate solution with the mass fraction of 15% under the stirring condition, and stirring for 3h to obtain a second mixture.
(3) And (3) uniformly stirring the second mixture, heating to 80 ℃, adjusting the rotating speed to 200r/min, adding 20g of sodium gluconate, stirring for 3h, and cooling to room temperature to obtain transparent liquid serving as a cross-linking agent.
In the preparation method, the polyhydric alcohol is ethylene glycol, the boron compound adopts boric acid to provide borate ions, the alkali solution is 15% sodium carbonate solution, and the organic ligand is sodium gluconate.
2. Base fluid for preparing fracturing fluid
Weighing 400g of water, adding 0.8g of hydroxypropyl guar gum under the stirring condition, dissolving for 5min, adding 0.4g of bactericide, 0.8g of clay stabilizer and 0.8g of anti-swelling agent, stirring and dissolving for 2min, and standing for 1h to prepare fracturing fluid base fluid with the mass concentration of the guar gum of 0.2%, wherein the concentration of the fracturing fluid base fluid is 21mpa · s.
3. Crosslinking performance and temperature and shear resistance of fracturing fluid
100g of the base fluid of the fracturing fluid prepared above is taken, 0.02g of pH regulator is added into the base fluid, the mixture is stirred for 30s, 0.025g of the prepared cross-linking agent is added into the mixture, and the mixture is stirredThe crosslinking time is 1min, and the crosslinking gel can be hung by a glass rod. The temperature resistance and the shearing resistance of the fracturing fluid are tested by an HAKKE high-temperature high-pressure rheometer at 85 ℃ for 170s by adopting a fracturing fluid temperature resistance and shearing resistance test method specified in SYT 5107-2016 Water-based fracturing fluid Performance evaluation method-1Under the condition, the temperature resistance and the shearing resistance of the fracturing fluid are realized, and the viscosity reaches 85mpa & s after 2.5 hours of shearing.
4. Gel breaking performance of fracturing fluid
100g of the prepared guanidine jelly is taken, 0.003g of capsule gel breaker is added, gel breaking is carried out in water bath at the temperature of 90 ℃, the gel breaking time is 80min, the viscosity after gel breaking is 1.95mpa & s, and the residue content is 4.52 mg/L.
Example 2
1. Compounding of crosslinking agent
(1) 100ml of water and 20ml of glycerol were added to a three-necked flask equipped with a stirrer, a reflux condenser and a constant pressure dropping funnel, and stirred uniformly to obtain a first mixture.
(2) Heating the first mixture in a water bath to 45 ℃, adjusting the rotating speed to 120r/min, adding 20g of sodium tetraborate and 15ml of sodium hydroxide solution with the mass fraction of 10% under the stirring condition, and stirring for 3 hours to obtain a second mixture.
(3) And (3) uniformly stirring the second mixture, heating to 80 ℃, adjusting the rotating speed to 200r/min, adding 20g of triethanolamine, stirring for 3 hours, and cooling to room temperature to obtain transparent liquid as a cross-linking agent.
In the preparation method, the polyalcohol is glycerol, and the boron compound adopts borax to provide borate ions; the alkaline solution is 10% sodium hydroxide solution, and the organic ligand is triethanolamine.
2. Base fluid for preparing fracturing fluid
Weighing 400g of water, adding 1.4g of hydroxypropyl guar gum under the stirring condition, dissolving for 5min, adding 0.4g of bactericide, 0.8g of clay stabilizer and 0.8g of anti-swelling agent, stirring and dissolving for 2min, and standing for 1h to prepare fracturing fluid base fluid with the guar gum concentration of 0.35%, wherein the fracturing fluid base fluid concentration is 36mpa · s.
3. Crosslinking performance and temperature and shear resistance of fracturing fluid
100g of the base fluid of the fracturing fluid prepared above is taken, and thenAdding 0.04g pH regulator, stirring for 30s, adding 0.035g crosslinking agent, stirring for 1min, and crosslinking for 1min30s, wherein the crosslinked gel can be hung with glass rod. The temperature resistance and the shearing resistance of the fracturing fluid are tested by an HAKKE high-temperature high-pressure rheometer at 120 ℃ for 170s by adopting a fracturing fluid temperature resistance and shearing resistance test method specified in SYT 5107-2016 Water-based fracturing fluid Performance evaluation method-1Under the condition, the temperature resistance and the shearing resistance of the fracturing fluid are respectively, and the viscosity is 75mpa · s after shearing for 1 hour.
4. Gel breaking performance of fracturing fluid
100g of the prepared guanidine jelly is taken, 0.005g of capsule gel breaker is added, gel breaking is carried out in water bath at 90 ℃, the gel breaking time is 90min, the viscosity after gel breaking is 1.95mpa & s, and the residue content is 3.78 mg/L.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A crosslinking agent for reconstructing wellbore fractures, comprising: the composition comprises the following components in parts by weight:
boron compound: 15-25 parts of liquid polyol: 10-20 parts of an alkali solution with the mass concentration of 10-20%: 15-20 parts of organic ligand: 20-25 parts of water: 1000 parts.
2. The crosslinking agent for reconstructing wellbore fractures as claimed in claim 1, wherein: the boron compound comprises one or two of borax and boric acid.
3. The crosslinking agent for reconstructing wellbore fractures as claimed in claim 1, wherein: the liquid polyol comprises one or more of glycerol, n-butanol and pentanol.
4. The crosslinking agent for reconstructing wellbore fractures as claimed in claim 1, wherein: the organic ligand comprises one or more of mannitol, sodium gluconate, lactic acid and citric acid.
5. The crosslinking agent for reconstructing wellbore fractures as claimed in claim 1, wherein: the alkali solution comprises one or more of sodium hydroxide, sodium carbonate or sodium bicarbonate.
6. A preparation method of a cross-linking agent for reconstructing wellbore fracturing is characterized by comprising the following steps: the method comprises the following steps:
step 1: preparing water and polyalcohol into a solution, adding the solution into a three-neck flask provided with a stirrer, a reflux condenser and a funnel, heating, stirring and refluxing, and heating to a first temperature to obtain a first mixture.
Step 2: the polyol solution is mixed with the boron compound and an alkali solution is added with stirring to obtain a second mixture.
And step 3: and mixing the organic ligand with the second mixture, stirring at a second temperature, and cooling to obtain the cross-linking agent.
7. The method of claim 6, wherein the cross-linking agent is selected from the group consisting of: in the step 1, heating the first mixture to a first temperature in a water bath, wherein the first temperature is 40-60 ℃.
8. The method of claim 6, wherein the cross-linking agent is selected from the group consisting of: in the step 2, the stirring speed of the stirrer is 50-200 r/min, and the stirring is carried out for 2-4 h at the first temperature.
9. The method of claim 6, wherein the cross-linking agent is selected from the group consisting of: in the step 3, after the organic ligand is added, the temperature is raised to a second temperature in the water bath kettle, stirring is carried out for 3-5 hours at the second temperature, the stirring speed is 200-300 r/min, and the second temperature is 70-90 ℃.
10. The cross-linking agent for reconstructing the shaft fracture is applied to the guanidine gum fracturing fluid, and is characterized in that: the composition comprises the following components in parts by weight: 0.002-0.004 parts of hydroxypropyl guar gum; 0.002-0.004 parts of the crosslinking agent; 0.003 to 0.005 part of pH regulator; 0.001-0.003 parts of a bactericide; 0.001 to 0.005 part of a clay stabilizer; 0.001-0.005 part of cleanup additive and the balance of water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111569947.0A CN114032083A (en) | 2021-12-21 | 2021-12-21 | Crosslinking agent for reconstructing wellbore fracture and preparation method and application thereof |
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